HP-35s New Moon Lander behavior

[Joe Horn]

(04-26-2019 12:08 AM)Kevin Braun Wrote:  Hmmm, I don't see a typo. Is it possible that my issue is modal? Could I be in the wrong mode?

I don't think so. Here's my next guess:

Go into program mode, press [GTO] [.] M019 [ENTER], then look at the top of the display. See the "EQN" annunciator? Now press the down-cursor key to advance to step M020. The "EQN" annunciator turns off. Now advance down all the way to M037, but stop after each key press and check the "EQN" annunciator. It should STAY OFF for ALL those steps between M020 and M037. Does it? If not, then delete that line and re-enter it NOT as an equation.

If that doesn't help, I'm all out of ideas.